SEAGULL Half-Frame Camera Filter 77mm Blue (model SB952)

The SEAGULL Half-Frame Camera Filter 77mm Blue (model SB952) is a screw-on optical accessory designed to fit lenses with a 77mm thread. It covers roughly half of the frame with a blue tint, allowing photographers to introduce a controlled color cast to part of the image without affecting the entire scene. The filter is intended for creative color effects, selective atmospheric enhancement, and on-location color correction where a partial blue tone improves composition or mood.

Advantages

This half-frame blue filter provides a simple mechanical solution for achieving split-color effects and graduated color transitions directly in-camera, reducing the need for extensive post-processing. The screw-mount design ensures a secure connection to any lens with a 77mm thread. By applying a blue cast to only part of the frame, the filter enables localized color control while preserving neutral tones elsewhere in the image.

Suitable for

• Landscape photography to deepen skies or create cooler horizons
• Portrait and environmental portrait work for stylized color separation
• Architectural and urban scenes where selective color highlights are needed
• Creative and experimental photography requiring on-camera color grading

Key specifications

• Mount type: 77mm screw thread compatible with lenses having 77mm filter rings
• Filter effect: blue color cast applied to approximately half of the image area
• Construction: optical filter element in a threaded metal or plastic carrier (screw-mount)
• Use: intended for partial-frame color modification and creative effects

How to use

Attach the filter by screwing it into the front filter thread of a lens with a 77mm diameter. Compose the scene so that the border between the blue and clear sections aligns with the area you want to tint; rotate the filter in the thread if slight adjustment of the division line is required. Meter and set exposure according to the dominant scene area, and review the preview or histogram to ensure the blue-tinted portion does not cause unwanted clipping. For consistent results, lock focus and recompute exposure after positioning the filter if necessary.

Usage recommendations

Use the SEAGULL half-frame blue filter when you need immediate in-camera color separation—especially with landscapes and skies. Combine it with graduated neutral-density or polarizing filters if balanced exposure or enhanced sky contrast is required. Store the filter in a protective case when not in use and clean the glass with a microfiber cloth and appropriate lens cleaner to avoid scratches and smudges.